Vent-valve



(No Model.) 6

B. F. GORDON & H. HOBBS.

VENT VALVE,

No. 266,462. Patented O0t.24, 1 ,882.

' I flzmm N. PETERS. numbin -1 m. Washington. D, c.

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EDiVARD F. GORDON AND HORATIO HOBBS, OF CONCORD, NEW HAMPSHIRE.

VENT-'VA LVE.

SPECIFICATION formingpart of Letters Patent No. 266,462, dated October 24, 1882.

Application filed May 26, 1882. (No model.)

perfect vent-valves for steam radiators, generators, &c., so that air may pass freely through such valves into or out of the radiator or generator at low steam-pressure, while at high pressure the steam is automatically retained.

Our invention consists in a cupor bulb for a steam-pipe, spanned by a flexible diaphragm adapted to yield under pressure ot'steam, so as to prevent the escape thereof, and permitting the passage of air or steam when the pressure is materially reduced.

1t also consists in such bulb or cup spanned by a flexible diaphragm and provided with a suitable vent, in combination with an arm or bar over the same, adapted to close the vent when the diaphragm is distended by the pressare.

It also consists in such devices, in combination with a cover to condense the escaping steam and a rim or wall to retain the waterof condensation and return it to the steam-pipe.

in the drawings, Figures 1 and 2 represent in elevation and vertical section the best form in which we have applied our invention, and illustrate its various features. Fig. 3 is a modification, omitting certain of the parts.

A is a pipe or tube leading from the interior of the radiator, and B a cup mounted on it. 0 is a flexible diaphragm fitting upon the edges of the cup and inclosing or covering the steamspace D. Screws E and washers or other devices insure a tightjoint.

When steam begins to form in the generator or is let into the radiator the air contained therein is gradually displaced; and in order to phragm (J and terminating just above it, as in Fig. 3, in which the diaphragm is not perforated, and in its yielding comes into contact with the extremity of the tube and keeps the vent F closed while the pressure continues, but opens it when the pressure is relieved. Ve prefer, however, the construction shown in Figs. 1 and 2, in which the diaphragm is perforated centrally to form a vent, and an arm, G, projects from the edge thereofinwardly, so as to cover the perforation and close the passage when there is sufficient pressure to distend the diaphragm. Theextremityofthearmisshown as provided in its under side with a plug, H, of vulcanized india-rubber, or of leather, against which the diaphragm, or a washer, K, thereon, impinges at the perforated point, the object of this yielding plug being to insure a more perfect joint. It is obvious, however, that a rubber or other flexible diaphragm pressing against the plane or convex surface of the smooth metal would be of similar advantage. The arm G is most conveniently formed integral with the annular rim L, which serves to retain the water of condensation dueto any steam passing through the vent and condensed beneath the ventilated cover M. The screws E hold the rim L and the diaphragm in posi- 1. A vent-valve for radiators, 850., consistranged relatively to automatically close the vent under heavy pressure and open it when the pressure is relieved, for the purposes set forth.

2. The combination of a steam-cup spanned by a flexible diaphragm and provided with a suitable vent, and an adjacent arm or bar adapted to close the vent when the diaphragm is distended, substantially as and for the purposes set forth.

3. The cup B, with its perforated diaphragm, in combination with the arm G, retaining-rim L, and cover M, for the purposes set forth.

In testimony whereof we hereto affix our signatures in presence of two witnesses.

EDWARD F. GORDON.

' HORATIO HOBBS.

Witnesses NATHANIEL E. MARTIN, FRED H. GOULD. 

